Robustness of non-locality in many-body open quantum systems

TL;DR

This paper demonstrates that non-local correlations persist and can be detected in many-body open quantum systems, even under noise and repeated measurements, highlighting their potential for quantum cryptography.

Contribution

It reveals the robustness of non-locality in open quantum systems, extending understanding beyond isolated systems and considering practical noisy scenarios.

Findings

Non-local correlations are present in steady-state and transient regimes.

Non-locality can be robust against noise in open systems.

Non-local correlations survive repeated measurements, relevant for quantum cryptography.

Abstract

Non-locality consists in the existence of non-classical correlations between local measurements. So far, it has been investigated mostly in isolated quantum systems. Here we show that non-local correlations are present, can be detected and might be robust against noise also in many-body open quantum systems, both in the steady-state and in the transient regime. We further discuss the robustness of non-local correlations when the open quantum system undergoes repeated measurements, a relevant scenario for quantum cryptography.